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答：你的需求有点怪异。11.6英寸机型的处理器不太强（除未上市的华硕ux21），和12.5英寸的版本是一个只有相关。事实上，你需要从一个小规模经营的书开始，这个12英寸的ThinkPad X220系列的第一选择。
If you don't have much budget, you are recommended to purchase ThinkPad X220i 4286A19, the price is about 6000 yuan, which is equipped with Core I3 2310M processor, 2G memory, HD3000 integrated graphics card, 250GB hard disk, the weight is 1.5kg, the performance is more mainstream, coping with plane CAD is still acceptable.If you have enough budget, recommend ThinkPad X220 4286c13, the price is 7900 yuan, Core i5 2410M processor is adopted, CPU performance is better, handling CAD will be more handy, and the weight is also lighter, only 1.3KG.All of the two models are recommended to add a 2GB memory to improve performance.